Analysis of Variance
For each transcript, we fit a two-way (12 X 2) general linear model using factors:
age, strain and their interaction. The first factor has 11 levels starting from
E12 to P9 time points . The second factor has two levels: DBA2 and BL6. p-values
are calculated for the main and interaction effects. We are most interested in identifying
genes for which there is a significant interaction between development stage and
strain effect indicating that the strain alters the time course of gene expression.
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